一种高增益中功率音频放大电路

2019 1st International Conference on Advances in Information Technology (ICAIT) Pub Date : 2019-07-01 DOI:10.1109/ICAIT47043.2019.8987359

R. B. Yogananda Reddy, K. Krishna, S. Bhavani, M. Chaitanya, G. Rekha, T. Shireesha

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引用次数: 0

摘要

本文设计并仿真了一种采用ab级输出级的高增益中功率离散音频放大器。音频放大器使用分立有源器件，如bjt和jfet。它由前置放大级、音调控制电路和ab类互补对称输出级组成。由于其高输入阻抗，jfet用于音频放大器的输入端。放大电路的其余部分使用在有源区域工作的bjt。一个米勒电容被连接来改变电路的带宽。由于单级放大器表现出有限的增益，所提出的音频放大器采用多级米勒电容。采用一套通用规范进行设计，并利用Microwind软件进行仿真。电路由±10V电源供电，功耗为946mW。测量到的3db频率接近音频范围(48Hz至22.5 KHz)。总谐波失真(THD)测量值为5.4%，并模拟了输入电阻和输出电阻随频率曲线的响应。

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A High Gain Medium Power Audio Amplifier Circuit

In this proposed work, a high gain and medium power discrete audio amplifier utilizing a class-AB output stage is designed and simulated. The audio amplifier uses discrete active devices such as BJTs and JFETs. It consists of a pre-amplification stage, tone control circuit and class-AB complementary-symmetry output stage. Due to their high input impedance, JFETs are used at the input side of the audio amplifier. The remaining part of the amplifier circuit uses BJTs operated in active region. A miller capacitance is connected to vary the bandwidth of the circuit. Since single stage amplifiers exhibit limited gain, the proposed audio amplifier incorporates multiple stages with miller capacitance. The design was carried out assuming a set of general specifications and simulated using Microwind software. The circuit is powered from a ±10V power supply and the power consumption is found to be 946mW. The measured 3-dB frequencies were found near to the audio frequency range (48Hz to 22.5 KHz). The total harmonic distortion (THD) is measured to be 5.4%, while the responses of input resistance and output resistance versus frequency curves have been simulated.

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2019 1st International Conference on Advances in Information Technology (ICAIT)

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